1. Represents the weighted average price of the shares sold. The prices of the shares sold pursuant to the transactions ranged from $165.00 to $165.26 per share. The Reporting Person, upon request, will provide the Securities and Exchange Commission staff, the issuer, or a security holder of the issuer full information regarding the number of shares sold at each separate price.

2. Represents the weighted average price of the shares sold. The prices of the shares sold pursuant to the transactions ranged from $165.00 to $165.07 per share. The Reporting Person, upon request, will provide the Securities and Exchange Commission staff, the issuer, or a security holder of the issuer full information regarding the number of shares sold at each separate price.

3. Represents the weighted average price of the shares sold. The prices of the shares sold pursuant to the transactions ranged from $165.00 to $165.17 per share. The Reporting Person, upon request, will provide the Securities and Exchange Commission staff, the issuer, or a security holder of the issuer full information regarding the number of shares sold at each separate price.

4. These options are immediately exercisable.

5. These options vest in accordance with the following schedule: 16,108 vest on the first anniversary of the grant date and 16,109 vest on each of the second through fourth anniversaries of the grant date (March 5, 2015).

6. Each restricted stock unit represents a contingent right to receive one share of Class A Common Stock.

7. These restricted stock units vest in accordance with the following schedule: 1,612 vest on each of the first through third anniversaries of the grant date and 1,613 vest on the fourth anniversary of the grant date (March 5, 2015).

8. These options vest in accordance with the following schedule: 20,208 vest on each of the first through fourth anniversaries of the grant date (March 4, 2016).

9. These restricted stock units vest in accordance with the following schedule: 1,975 vest on each of the first through third anniversaries of the grant date and 1,976 vest on the fourth anniversary of the grant date (March 4, 2016).

10. These options vest in accordance with the following schedule: 17,135 vest on each of the first through fourth anniversaries of the grant date (March 6, 2017).

11. These restricted stock units vest in accordance with the following schedule: 1,758 vest on the first anniversary of the grant date and 1,759 vest on each of the second through fourth anniversaries of the grant date (March 6, 2017).

12. These options vest in accordance with the following schedule: 13,518 vest on each of the first and the third anniversaries of the grant date, and 13,519 vest on each of the second and the fourth anniversaries of the grant date (March 6, 2018).

13. These restricted stock units vest in accordance with the following schedule: 1,409 vest on each of the first through fourth anniversaries of the grant date (March 6, 2018).

Remarks:

/s/ Thomas P. Hunt, Attorney-in-Fact

06/29/2018

** Signature of Reporting Person

Date

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.

* If the form is filed by more than one reporting person,
see
Instruction
4
(b)(v).